作者
M Rafique, H Rehman, F Malik, MU Rajput, SU Rahman, MH Rathore
发表日期
2011/1/1
卷号
9
期号
2
页码范围
77-87
出版商
INTERNATIONAL JOURNAL OF RADIATION RESEARCH
简介
Background
Health hazards associated with exposure due to the natural radioactivity which is a part of our physical environment are of great concern. In order to assess the risks associated with exposure due to the natural radioactivity in soil and BUILDING MATERIALS, extensive studies have been carried out all over the world. The most commonly encountered radionuclide’s are 238U, 232Th, their decay products and 40K.
Materials and Methods
In order to study the concentration of these radionuclides soil, sand, gravel aggregates, bricks and marble, samples were collected from different sites and local suppliers of the district Mirpur, Azad Kashmir (Pakistan). 226Ra, 232Th, and 40K activities in the collected samples were measured using HPGe detector. The measured specific radioactivity concentration of 226Ra, 232Th and 40K in the studied samples ranged from 10±1 to 47±2, 18±1 to 75±4 and 40±3 to 683±3 Bq. kg-1, respectively.
Results
From the measured activity concentration, RADIUM EQUIVALENT ACTIVITY, EXTERNAL AND INTERNAL HAZARD INDICES, gamma and alpha indices, terrestrial absorbed dose and ANNUAL EFFECTIVE DOSE wer calculated. Maximum value of RADIUM EQUIVALENT ACTIVITY of 197.1±9 Bq. kg-1 was observed in soil sample whereas minimum value of 45.9±2 Bq. kg-1 was found in gravel aggregates. Relatively higher mean values of hazard indices were found in brick samples. ANNUAL EFFECTIVE DOSE varied from 0.06±0.01 to 0.47±0.02 mSv. y-1.
Conclusion
Current values of ANNUAL EFFECTIVE DOSE, RADIUM EQUIVALENT ACTIVITY and hazard indices have been found to be within the …
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